Compound turbine blower



Patented June 6, 1922 E. 0. GREEN. COMPOUND TURBINE BLOWER.

COMPOUND TURBINE BLOWER.

L41 8*, 704, Specification of Application filed April 11,

To all whom it may concern Be it known that I, EDWARD D. GREEN, a Icitizen of the United States, and a resident of Chicago, Cook County,and Stateof Illinois, have invented certain new and useful Improvementsin Compound Turbine Blowers, of which the following isdeclared to be afull, clear, and exact description.

This invention relates to blowers, and its principal object is to obtaina maximum pressure with a minimum expenditure of power. Ordinary fanblowers develop only a limited amount of pressure for a given size, andalthough positive blowers develop higher pressure, it is at theexpenditure of much power. One of the objects of this invention is toobtain greater air pressure than is now possible with a fan blower, withless power than is required for driving a positive blower. lVith theseand other objects and advantages in view, this invention consists in theseveral novel features of construction, arrangement and combination ofparts, hereinafter fully set forth and claimed.

The invention is clearly illustrated in the accompanying drawing, inwhich 1-- Fig. "l is a central longitudinal section through a blower,embodying a simple form of the present invention; Fig. 2 is a crosssection taken on line 22 of Fig. 1; Fig. 3 is a cross section taken online.3-3 of Fig. 1; and Fig. 4: is a perspective view of one of theblades of the blower fan.

Referring to said drawing, the reference character 10 designates ablower casing, which comprises a cylindrical'wall or shell 11 and twoheads or ends 12, 18, riveted or otherwise secured thereto. Concentricwith said cylindrical wall or shell, and extending through the casing,is a drive shaft 14 which is journaled in suitable bearings on oradjacent the casing. Said shaft is connected to and driven by anysuitable power. mech anism, and it is here shown as coupled with Y anelectric motor ll'mounted on a base 18 adjacent the fan casing. Saidcasing has an axially disposed air inlet opening 19 in one head 12 and atangential air discharge opening 20 in its cylindrical wall 11.,adjacent its other head 13. 7

Within the casing are a number of 'intercommunicating air chambers 21,22, 23, 24L, in which are fans 25, 26, that are mounted j on the driveshaft 14, each fan 25 being arsecured to the casing wall 11.

Letters Patent Patented June 6, 1922.

1921. Serial No. 460,578.

ranged to force air from the chamber in which it is located, to anadjacent chamber, and the fan 26 being arranged to discharge the airfrom the easing into the conduit (not shown) which conveys it to itswork.

The air chambers 21,22, 23,are of greater diameter and considerablywider than the fans 25, and each chamber is made up of a transversesidewall 21 having a central opening, and a curved end wall 21 To theedge portion of the curved end wall 21 may be secured a second side wall21 which is also formed with a central opening registering with thecentral opening in an ad j acent side wall 21 The air chamber members21, 22, 23, are secured in the casing 10 in any suitable manner, and inthe drawing, I have shown them as abutting against each other, theinnermost one abutting against a ring or angle iron member 11 which isSet screws 11*, threaded in the head 12 and bearing against theoutermost. air chambermember, may be provided to crown the air chambermembers together with the innermost one crowded against the ring 11 Theair chamber 24 is contained between the innermost air chamber member 23and head 13 of the casing, and the inlet from the air chamber 23 to theair chamber 24 is through an annular passage 24 which leads to the fan26.

The fans lettered 25 are practically alike and a description of one willsul'lice for all. The hub portion 27 of the fan is formed with a numberof spokes 28, and a circular plate orflange' 29. To said flange 29 isbolted, riveted or otherwise secured, a disc 30 and to said disc aresecured a number of fan blades 31, certain of which are also secured tothe spokes 28. To the edges of said fanblades,'opposite the edges whichare secured to the disc 30, is secured a ring or circular centrally opendisc .32, which is of greater diameter than the disc 30, and its centralopening 33 is preferably of about the same area as the inlet opening 19to the casing. The fan blades 31 extend radially from the inlet orcentral opening and pro ject beyond the periphery of the disc 30, to theperiphery of the ring or disc 32.

Each blade is flat throughout the greater part of its length, as at 34(see Fig. 4) and the fiat portion extends radially in a plane parallelwith the shaft 14. The portions of the blades which project beyond thedisc 3 are shaped to deflect the course of the air from the fan, andturn it laterally therefrom, as is indicated by the arrows thereon inFig. 1, into the portion of the air chamber which is on the dischargeside of the fan, from which it enters the adjacent air chamber. Toobtain this lateral deflection of the air and to reduce the effectivediameter of the fan and consequently to reduce the power required, theend portions of the fan blades, which project beyond the disc 30, aretipped back along the lateral discharge side of the fan, so as to slopeback from one side of the fan to the other and their end portions arebent forward--that is, in the line of travel of the blades-thusproviding concave faces on the front parts of the projecting endportions of the blades which slope back from one side of the fan to theother. Conveniently, the end portions 34: of the fan blades may be bentback along diagonal lines running from the edge of one disc to the edgeof the other, and the extreme end portions 349 are bent forward, as isclearl illustrated in Fig. a.

By reason of the formation of the blades just described, air enteringbetween the fan blades (when the blower is in operation) will be thrownoutward and deflected laterally into the open space in the air chamberfrom which it moves at great velocity, into the fan in an adjacent airchamber, which forces it into an adjacent air chamber 23 and so on untilit reaches the air chamber 24.

The fan in the air chamber 24 may be of the ordinary blower type of fanand, as shown, comprises, spaced discs 32*, 30 transverse blades 31*therebetween, and a hub 27 connected thereto. The disc 30 is solid, butthe disc 32 is formed with a cen. tral opening which communicates withthe adjacent air chamber 23 through the air passage 2%. Said fan 26discharges the air out through the discharge opening 20 from which it isconveyed by the conduit to the work to be performed.

To reduce friction and end thrust upon the shaft 14, I mount the fans 25adjacent the walls of their air chambers which contain the inletopenings, and mount the fan 26 adjacent the wall opposite the onecontaining the inlet opening, as is clearly i llus trated in Fig. 1. Theair pressure upon the closed sides of the fans 25 is therebycounterbalanced to some extent by the air pres sure on the open side ofthe fan 26.

More or less variation of the exact details of construction is possiblewithout departing from the spirit of this invention; I desire,therefore, not to limit myself to the exact form of the constructionshown and described, but intend. in the following claims, to point outall of the invention disclosed herein.

I claim as new, and desire to secure by Letters Patent:

1. A blower comprising, a fan casing having an axial inlet opening and atangential discharge opening, a shaft, and a fan thereon revoluble insaid casing and comprising radially extending discs, one of which has anaxial opening communicating with the inlet opening of the casing, andradial fan blades extending transversely between said discs in planesparallel with said shaft, said fan blades having end portions extendingbeyond the edge of one disc and thereat angularly disposed with respectto the portions of the blades within the marginal edge of said disc. 7

2. A blower comprising, a fan casing having an axial inlet opening and atangential discharge opening, a shaft, and a fan thereon revoluble insaid casing and comprising radially extending discs, one of which has anaxial opening communicating with the inlet opening of the casing, andradial fan blades extending transversely between said discs in planesparallel with said shaft, said fan blades having end portions extendingbeyond the edge of one disc and being tilted back on oblique linesrunning from the edge of said disc, the extreme end portions of saidblades being bent forward.

3. A blower comprising a fan casing having an axial inlet opening and atangential discharge opening, a shaft, and a fan thereon revoluble insaid casing and comprising radially extending discs, one of which has anaxial opening communicating with the inlet opening of the casing, andradial fan blades extending transversely between said discs in planesparallel with said shaft, said fan blades having end portions extendingbeyond the edge of one disc and the side edges of said end portions ofthe blades at that side of the fan being concave and the faces of saidend portions sloping away from said concave edges and merging into theopposite straight edges of the blades.

4. A. blower comprising a fan casinghaving an axially arranged inletopening and a tangential discharge opening, a shaft, a fan thereonrevoluble in said casing and comprising two spaced radially extendingdiscs, one of which has an axial opening coinciding with the inletopening of the casing, said disc being of greater diameter than theother disc, and radial fan blades secured to and extending between saiddiscs in planes parallel with said shaft, said fan blades having endportions extending beyond the edge of the smaller disc to the edge ofthe larger one and being tilt-ed back on oblique lines running from theedge of one disc to the edge of another, the extreme end portions ofsaid blades being bent forward.

A blower comprising in combination, a casing having a plurality ofintercommunicating chambers, opening one into the other through axialopenings, and there being a tangential discharge opening from the airchamber at one end, a drive shaft in said casing, a blower fan mountedon said shaft in one air chamber and having angularly disposed fan bladeends for discharging air laterally from the fan, and a centrificallyacting blower fan in the air chamber having the tangential dischargeoutlet.

6. A blower comprising in combination a casing having a plurality ofintercommunieating air chambers, opening one to the other through axialopenings and there being a tangential discharge opening from the endmostone of said air chambers, a drive shaft in said casing, blower fansmounted on said shaft in certain of said air chambers adjacent the inletsides thereof and having angularly disposed fan blade ends fordischarging air laterally from the fans, and a centrifically actingblower fan mounted on said shaft in the chamber containing the dischargeopening and adjacent the wall opposite the one containing the air inletopening.

7. A blower comprising in combination, a casing having an air outletchamber at one end, a plurality of other air chamber members secured insaid casing at one side of said air outlet chamber, all of said chambersbeing intercommunicating, a drive shaft in said casing, blower fansmounted on said shaft in said air chambers, those in the chambers otherthan the outlet air chamber having angularly disposed fan blade ends fordischarging air laterally from the fans, substantially as described.

EDWARD D. GREEN.

